Air purifier



FIG. 1 is a front perspective view of an air purifier, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is an enlarged view of the portion 8 in FIG. 1;

FIG. 9 is an enlarged view of the portion 9 in FIG. 1;

FIG. 10 is an enlarged view of the portion 10 in FIG. 2; and,

FIG. 11 is an enlarged view of the portion 11 in FIG. 4.

The evenly-dashed broken lines in the figures depict portions of the air purifier and the environmental subject matter and form no part of the claimed design.

The dot-dash broken lines in the figures define a boundary of the claimed design and form no part of the claimed design.

The dot-dot-dash lines encircling enlargement portions of the claimed design form no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 